if2: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/if2 - from package: ctsim

You may install the required package with command apt-get install {package}

Error in other languages:
if2: bevel nie gevind nie
if2: comandă negăsită
if2: comando não encontrado
if2: commande introuvable
if2: command not found
if2: käsku ei ole
if2: không tìm thấy lệnh
if2: komanda nerasta
if2: Kommando nicht gefunden.
if2: kommandot finns inte
if2: komut yok
if2: nie znaleziono polecenia
if2: níor aimsíodh an t-ordú
if2: no se encontró la orden
if2: no s'ha trobat l'ordre
if2: opdracht niet gevonden
if2: parancs nem található
if2: perintah tidak ditemukan
if2: príkaz nenájdený
if2: příkaz nenalezen
if2: команда не найдена
if2: командата не е открита
if2: 命令找不到
if2: コマンドが見つかりません